Disgusting treatment and customer service

One thing that really disappointed me was the treatment we received from the General manager at the highveld branch. My husband identified coaches that he loved and we decided to head over to the highveld branch to have a look at them and purchase. Upon our Arrival, we identified other coaches we loved and decided to purchase them but unfortunately they didn't “have” stock. We asked to purchase the display and the salesman that assisted us said they cannot sell the display. My husband asked to speak go the GM, upon her arrival she was extremely rude but anyways my mom in law asked for a discount and she said she can only give a discount of a R100 fine as normal, we asked for a further discount of about R500 and SO rudely she said no. (Note, in between my mom in law and GM were talking and the GM was very rude).. We decided to go ahead and pay for the coaches but there was still an issue with the salesman that was assisting us, he was also rude and didn't seem like he wanted to help us to purchase the display coach and the R100 discount was negotiated on our behalf by another friendly salesman. When we arrived at the counter to pay, the first salesman was still following us around, by than i had moved away from the counter to try and calm my mom in law down as she was extremely shocked by the GM’s rudeness. At the counter my husband said the first salesman had told him why didn't he go to mr price home to buy coaches after my husband said he didn't want to give the sale to him. It than lead to a point where my husband slapped him as he didn’t appreciate how he spoke to him. The guy than went to the back to inform the GM and she just came straight out of that room and started swearing at us. Clearly that woman had something against us for no reason. She so rudely told the delivery guys to lock the doors and call the police. We were very relaxed, she probably thought we scared of the police or something (lol) anyways inside we all go really upset and started exchanging hurtful words and luckily the security people came including the boss of that security company and they saw that GM’s disgusting behavior. We really felt attacked and wondered for a moment is it because we black or something? Thats why we reacted and defended ourselves. I am a Manager myself and i know for sure thats not how you treat a customer. As the saying goes, the customer is always right but in this case this was a personal attack. I am really disappointed as we don't know if our complaint will ever be heard because we found out that this is like a family business. We still bought the coaches we wanted at another branch in silverlakes and to our surprise everybody at that warehouse knew what went down at the highveld branch. We were so ready to speak our hearts out to the GM at the silverlakes branch but only to find out he is the husband of that rude woman at the highveld branch and the brother is the owner of the business. We really hope this matter will be looked at from a customer service perspective.